Our vision registers and distinguishes more shades of green than any other colour by a very large number. Even desert people love green and will expend large amounts of resources and effort to create pleasure gardens in fairly hostile environments. I know in myself, I am more comfortable and at times even awe-struck in green wild places. To me, walking through an old-growth forest is more of a religious experience than going to any church.

It's probably those old hunter-gatherer instincts at play, yes but why? I mean, we aren't even really equipped to eat just leaves and grass. Our appendix is small and quite useless and we only have one stomach. If we tried to live on a diet of just (uncooked) greens I think we might get quite ill after a while. But the colour green is said to be a healing colour and is also said to symbolise hope. It is the colour of new life in spring I guess but even people who live in the tropics are still drawn to green even though they are surrounded by it all year round. It really must go right back to the common roots of all humanity and perhaps even further back than that.